What materials are used to make the tool or device? Why did the designers pick those materials?

the materials used to make the tools or device are plastic rubber iron etc. designers pick those materials to make tools or devices

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."